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29 August, 03:17

It takes ten identical pieces to form a circular track for a pair of toy racing cars. If the inside arc of each piece is 3.4 inches shorter than the outside arc, what is the width of the track? ... ?

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  1. 29 August, 04:24
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    Length of outer track = sum of length of 10 pieces = circumference of the outer circle

    if R is the Radius of outer circle then ...

    Circumference of the outer track = 2pi*R

    Similarly the circumference of the inner track (with radius r) = 2pi*r

    length of each outer piece is 3.4 inch more than length of inner piece

    So total outer length is 10*3.4 = 34 inches more than the inner length.

    => Outer Circumference - Inner Circumference = 34 inches

    => 2pi*R - 2pi*r = 34

    => 2pi (R - r) = 34

    => R-r = 34/2pi = 5.41 inches

    => R-r = Width of the track = 5.41 inches
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